We propose a new framework of collective decision-making, which takes conflicts of interest among the voters and voting alternatives (e.g., among committee members/referees and applicants/contestants for some competition) into account. We define accountability by properties of social welfare...

We consider social decision-making situations where some voters may have a conflict of interest in some social alternatives/applicants to be ranked. Then the accountability of the collective decision process is essential. We extend the standard social welfare function to include the interest...

The aim of this paper is to characterize incomplete preferences with optimism and pessimism (IPOP) over Anscombe-Aumann acts, a class of preference orders that may fail axioms that require the decision-maker to think contingency. The main result axiomatizes preferences that compare any pair of...